CN111883064B - Pixel driving circuit and driving method thereof, display panel and display device - Google Patents
Pixel driving circuit and driving method thereof, display panel and display device Download PDFInfo
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- CN111883064B CN111883064B CN202010808781.2A CN202010808781A CN111883064B CN 111883064 B CN111883064 B CN 111883064B CN 202010808781 A CN202010808781 A CN 202010808781A CN 111883064 B CN111883064 B CN 111883064B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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Abstract
The invention provides a pixel driving circuit, a driving method thereof, a display panel and a display device, wherein the pixel driving circuit comprises: the device comprises a threshold voltage compensation and charging unit, a reset unit, a driving transistor and a storage unit; in the reset stage, the reset unit is conducted, and the reference voltage is transmitted to the intermediate node; in the threshold voltage compensation and charging stage, a data signal line and an intermediate node are conducted, the voltage of the intermediate node is configured to be the data signal voltage acquired when a sampling transistor is short-circuited as a diode, and the data signal voltage is transmitted to a grid electrode of a driving transistor and is charged into a first end of a storage unit; the driving transistor supplies a driving current to the light emitting device according to a voltage of the intermediate node held by the first terminal of the memory cell during a light emitting period. According to the embodiment of the invention, the uniformity of the image brightness of the display panel and the display area of the display device can be improved. In addition, a light-emitting control unit and a circuit for providing a control signal for the light-emitting control unit are omitted, and the display panel is favorable for realizing a narrow frame.
Description
Technical Field
The invention relates to the technical field of display equipment, in particular to a pixel driving circuit, a driving method thereof, a display panel and a display device.
Background
With the wide development of display technology, Organic Light-Emitting Diode (OLED) displays are increasingly used in various electronic devices. As the display size increases, the conventional Passive matrix organic electroluminescent display (Passive matrix oled) requires a shorter driving time of a single pixel, and thus requires an increase in transient current and an increase in power consumption. Meanwhile, the application of large current can cause overlarge voltage drop on the indium tin oxide metal oxide wire, and the working voltage of the OLED is overhigh, so that the service life of the OLED is shortened. The active matrix organic electroluminescent display (AMOLED) can well solve the problems by inputting OLED current by scanning the switching transistors line by line.
The AMOLED display includes an organic light emitting diode array (i.e., a pixel array) formed of a plurality of organic light emitting diodes and a pixel driving circuit array. The pixel driving circuit provides light emitting current for the organic light emitting diodes in the organic light emitting diode array to make the organic light emitting diodes emit light.
The light emission luminance of the organic light emitting diode is proportional to the magnitude of a light emission current flowing therethrough. The pixel driving circuit in the prior art includes a driving transistor. The light emission current generated by the pixel driving circuit in the prior art is closely related to the threshold voltage of the driving transistor. The threshold voltages of the respective driving transistors are not completely the same due to various reasons such as formation process, aging, and the like. Because the threshold voltages of the driving transistors are not completely the same, the driving currents flowing through the organic light emitting diodes in the AMOLED display are not completely the same, and the brightness uniformity of the organic light emitting display panel is poor when the organic light emitting display panel displays images.
In addition, in order to eliminate the influence caused by the difference between the threshold voltages of the driving transistors, the conventional AMOLED pixel driving circuit usually has a complicated structural design and occupies a large area, which is not favorable for increasing PPI (pixel density).
Disclosure of Invention
The invention provides a pixel driving circuit, a driving method thereof, a display panel and a display device, and aims to overcome the defects in the related art.
To achieve the above object, a first aspect of embodiments of the present invention provides a pixel driving circuit for driving a light emitting device to emit light, the pixel driving circuit including:
the threshold voltage compensation and charging unit comprises a sampling transistor, wherein a first pole of the sampling transistor is electrically connected with a data signal line, a grid electrode of the sampling transistor is electrically connected with the intermediate node, and a second pole of the sampling transistor is suitable for being electrically connected with the grid electrode;
the reset unit has an input end electrically connected to the reference voltage line, a control end electrically connected to the reset signal line, and an output end electrically connected to the intermediate node;
a driving transistor, a first pole of which is electrically connected to a power line, a gate of which is adapted to be electrically connected to the intermediate node, and a second pole of which is electrically connected to the light emitting device; and
a memory cell, a first end of which is electrically connected to the grid of the driving transistor and a second end of which is electrically connected to the power line;
wherein, in a reset phase of the pixel driving circuit, the reset unit transmits the reference voltage inputted by the reference voltage line to the intermediate node under the control of a reset signal inputted by the reset signal line;
in a threshold voltage compensation and charging stage, the reference voltage keeps the threshold voltage compensation and charging unit to conduct the data signal line and the intermediate node, the voltage of the intermediate node is configured to be the data signal voltage acquired when the sampling transistor is short-circuited into a diode, and the voltage of the intermediate node is transmitted to the grid electrode of the driving transistor and charged into the first end of the storage unit;
the driving transistor receives a current supplied from the power line and supplies a driving current to the light emitting device according to a voltage of the intermediate node held by the first terminal of the memory cell during a light emitting period.
Optionally, the reset unit includes a reset transistor, a first pole of the reset transistor is electrically connected to the reference voltage line, a gate of the reset transistor is electrically connected to the reset signal line, and a second pole of the reset transistor is electrically connected to the intermediate node;
and/or the threshold voltage compensation and charging unit comprises: the sampling transistor, the first switch circuit, the second switch circuit and the voltage stabilizing capacitor are connected in series;
the voltage stabilizing capacitor is used for stabilizing the voltage of the grid electrode of the sampling transistor and keeping the sampling transistor on; the first switch circuit is controlled by a switch signal and is used for controlling the sampling transistor to be in short circuit to form a diode; the second switch circuit is controlled by a switch signal and is used for controlling the voltage of the intermediate node to be transmitted to the grid electrode of the driving transistor and to be kept at the first end of the storage unit;
and/or the memory cell comprises a storage capacitor.
Optionally, the first switching circuit comprises a first switching transistor and the second switching circuit comprises a second switching transistor;
the first pole of the first switch transistor is electrically connected to the second pole of the sampling transistor, the grid electrode of the first switch transistor is electrically connected to the scanning signal line, and the second pole of the first switch transistor is electrically connected to the grid electrode of the sampling transistor, the second polar plate of the voltage stabilizing capacitor, the first pole of the second switch transistor and the second pole of the reset transistor;
the grid electrode of the second switch transistor is electrically connected with a scanning signal line, and the second pole electrode is electrically connected with the grid electrode of the driving transistor and the first pole plate of the storage capacitor.
Optionally, the sampling transistor, the driving transistor, the reset transistor, the first switching transistor, and the second switching transistor are all P-type transistors; or the sampling transistor, the driving transistor, the reset transistor, the first switching transistor, and the second switching transistor are all N-type transistors.
A second aspect of embodiments of the present invention provides a display panel including the pixel driving circuit described in any one of the above.
A third aspect of embodiments of the present invention provides a display device including the display panel described in any one of the above.
A fourth aspect of the embodiments of the present invention provides a driving method of a pixel driving circuit, including: a reset stage, a threshold voltage compensation and charging stage and a light-emitting stage;
the reset phase, inputting a reset signal to the reset signal line, and transmitting the reference voltage input by the reference voltage line to the intermediate node;
in the threshold voltage compensation and charging stage, the sampling transistor is controlled to be in short circuit to form a diode, and the data signal voltage acquired when the sampling transistor is in short circuit to form the diode is transmitted to the grid electrode of the driving transistor and is kept at the first end of the storage unit;
and the light-emitting stage is used for controlling the driving transistor to receive the current supplied by the power line and provide driving current for the light-emitting device according to the data signal voltage held by the first end of the storage unit.
Optionally, the sampling transistor is controlled to be in short circuit, and the first switching transistor is turned on by inputting a scanning signal to a scanning signal line through the diode;
the first switch transistor has a first pole connected to the second pole of the sampling transistor, a gate connected to the scanning signal line, and a second pole connected to the gate of the sampling transistor.
Optionally, the control unit is configured to control the data signal voltage acquired when the sampling transistor is shorted as a diode to be transmitted to the gate of the driving transistor and to be held at the first end of the storage unit, and to input a scanning signal to the scanning signal line to turn on the second switching transistor;
the first pole of the second switch transistor is connected to the grid of the sampling transistor and the second pole of the first switch transistor, the grid is connected to the scanning signal line, and the second pole is connected to the grid of the driving transistor and the first end of the storage unit.
Optionally, in the reset phase, a scan signal is input to the scan signal line, so that the first switching transistor and the second switching transistor are turned off.
In the embodiment of the invention, in the threshold voltage compensation and charging stage, the data signal voltage of the data signal line is collected by the sampling transistor and is kept at the grid electrode of the driving transistor; the sampling transistor is short-circuited as the diode when acquiring the data signal voltage, so the acquired data signal voltage is compensated for the threshold voltage of the sampling transistor, and the threshold voltage of the sampling transistor and the threshold voltage of the driving transistor in a minimum local area are basically the same, so the drift of the threshold voltage of the compensated driving transistor can be considered. Therefore, in the light emitting stage, the working current for the light emitting device to emit light is only related to the data signal voltage input by the data signal line and is not related to the threshold voltage of the driving transistor, and the influence of the threshold voltage drift on the light emitting device can be avoided, so that the working current for driving the light emitting device to emit light is kept stable, and the uniformity of the image brightness of the display panel and the display area of the display device is improved. In addition, a light-emitting control unit and a circuit for providing a control signal for the light-emitting control unit are omitted, so that the structure of the pixel driving circuit can be simplified, the pixel density can be improved, and the narrow frame of the display panel can be realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a circuit diagram of a pixel driving circuit according to a first embodiment of the present invention;
fig. 2 is a flow chart of a driving method of the pixel driving circuit in fig. 1;
FIG. 3 is a timing diagram corresponding to the driving method of FIG. 2;
fig. 4 is a current flow diagram of the pixel driving circuit in the reset phase;
FIG. 5 is a current flow diagram of the pixel driving circuit during the threshold voltage compensation and charging phase;
fig. 6 is a current flow diagram of the pixel driving circuit in the light emitting phase;
fig. 7 is a circuit diagram of a pixel driving circuit of a second embodiment of the present invention;
fig. 8 is a timing diagram corresponding to the driving method of the pixel driving circuit in fig. 7.
List of reference numerals:
threshold voltage compensation and charging unit 1 reset unit 2
The sampling transistor T1 drives the transistor T2
Reset transistor T3 first switch transistor T4
Intermediate node G of second switching transistor T5
Storage capacitor C1 voltage stabilizing capacitor C2
Reset signal Vrset reference voltage Vint
Scan signal voltage Vscan power supply voltage Vdd
Data signal voltage Vdata ground voltage Vss
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a circuit diagram of a pixel driving circuit according to a first embodiment of the present invention.
Referring to fig. 1, a pixel driving circuit for driving a light emitting device D to emit light includes:
the threshold voltage compensation and charging unit 1 comprises a sampling transistor T1, wherein a first pole of the sampling transistor T1 is electrically connected to a data signal line, a grid electrode is electrically connected to the intermediate node G, and a second pole is suitable for being electrically connected with the grid electrode;
the reset unit 2 has an input end electrically connected to the reference voltage line, a control end electrically connected to the reset signal line, and an output end electrically connected to the intermediate node G;
a driving transistor T2 having a first electrode electrically connected to the power line, a gate electrode adapted to be electrically connected to the intermediate node G, and a second electrode electrically connected to the light emitting device D; and
a memory cell 3 having a first end electrically connected to the gate of the driving transistor T2 and a second end electrically connected to a power supply line;
in the reset phase of the pixel driving circuit, the reset unit 2 transmits the reference voltage Vint input by the reference voltage line to the intermediate node G under the control of the reset signal Vrset input by the reset signal line;
in the threshold voltage compensation and charging stage, the reference voltage Vint keeps the threshold voltage compensation and charging unit 1 to conduct the data signal line and the middle node G, the voltage of the middle node G is configured to be the data signal voltage acquired when the sampling transistor T1 is short-circuited as a diode, and the voltage of the middle node G is transmitted to the gate of the driving transistor T2 and charged to the first end of the storage unit 3;
the driving transistor T2 receives a current supplied from the power line during a light emitting period, and supplies a driving current to the light emitting device D according to a voltage of the intermediate node G held by the first terminal of the memory cell.
The first pole may be one of a source and a drain, and the second pole may be the other of the source and the drain. The second pole of the driving transistor T2 may be electrically connected to the anode of the light emitting device D, and the cathode of the light emitting device D is electrically connected to the ground voltage Vss.
Specifically, referring to fig. 1, in the present embodiment, the reset unit 2 may include a reset transistor T3, a first pole of the reset transistor T3 is electrically connected to a reference voltage line, a gate is electrically connected to a reset signal line, and a second pole is electrically connected to the intermediate node G. The storage unit 3 may comprise a storage capacitor C1.
In other embodiments, the reset unit 2 and/or the memory unit 3 may also comprise other devices for implementing the reset or memory function. It can be understood that the reset transistor T3 and the storage capacitor C1 can make the pixel driving circuit simple and occupy a small area.
As shown in fig. 1, in the present embodiment, the threshold voltage compensation and charging unit 1 may include: the sampling transistor T1, the first switch circuit, the second switch circuit and the voltage stabilizing capacitor C2;
the voltage stabilizing capacitor C2 is used for stabilizing the voltage of the gate of the sampling transistor T1 and keeping the sampling transistor T1 turned on; the first switch circuit is controlled by a switch signal and is used for controlling the sampling transistor T1 to be short-circuited into a diode; the second switching circuit is controlled by a switching signal for controlling the voltage of the intermediate node G to be transmitted to the gate of the driving transistor T2 and held at the first terminal of the memory cell 3.
More specifically, the first switching circuit may include a first switching transistor T4, and the second switching circuit may include a second switching transistor T5.
A first pole of the first switching transistor T4 is electrically connected to the second pole of the sampling transistor T1, the gate is electrically connected to the scan signal line, and the second pole is electrically connected to the gate of the sampling transistor T1, the second plate of the voltage stabilizing capacitor C2, the first pole of the second switching transistor T5, and the second pole of the reset transistor T3;
the gate of the second switching transistor T5 is electrically connected to the scan signal line, and the second pole is electrically connected to the gate of the driving transistor T2 and the first plate of the storage capacitor C1.
The first plate of the voltage stabilization capacitor C2 is connected to the data signal line.
In other embodiments, the first switching circuit and/or the second switching circuit may also include other devices that perform the switching function. It can be understood that the first switch transistor T4 and the second switch transistor T5 can make the pixel driving circuit simple and occupy a small area.
In the present embodiment, the sampling transistor T1, the driving transistor T2, the reset transistor T3, the first switching transistor T4, and the second switching transistor T5 are all P-type transistors.
Fig. 2 is a flowchart of a driving method of the pixel driving circuit in fig. 1. Referring to fig. 2, an embodiment of the present invention further provides a driving method of a pixel driving circuit, including: a reset phase S1, a threshold voltage compensation and charging phase S2 and a light-emitting phase S3;
a reset phase S1 in which a reset signal Vrset is input to the reset signal line and a reference voltage Vint input from the reference voltage line is transmitted to the intermediate node G;
a threshold voltage compensation and charging stage S2, wherein the sampling transistor T1 is controlled to be short-circuited as a diode, and the data signal voltage acquired when the sampling transistor T1 is short-circuited as a diode is transmitted to the gate of the driving transistor T2 and is kept at the first end of the storage unit 3;
and a light emitting stage S3 for controlling the driving transistor T2 to receive the current supplied from the power line and to supply a driving current to the light emitting device D according to the data signal voltage held at the first terminal of the memory cell.
Fig. 3 is a timing diagram corresponding to the driving method of fig. 2. Fig. 4 is a current flow diagram of the pixel driving circuit in the reset phase; FIG. 5 is a current flow diagram of the pixel driving circuit during the threshold voltage compensation and charging phase; fig. 6 is a current flow diagram of the pixel driving circuit in the light emitting stage. The following is described in detail with reference to the timing diagram of fig. 3 and the pixel driving circuits shown in fig. 4 to 6:
referring to fig. 3 and 4, in the reset phase S1, the reset signal Vrset inputted from the reset signal line is at a low level, the reset transistor T3 is turned on, and the reference voltage Vint inputted from the reference voltage line is transferred to the intermediate node G.
The reset phase S1 enables initialization of the intermediate node G. Since the intermediate node G connects the gate of the sampling transistor T1, initialization of the gate of the sampling transistor T1 is achieved.
In the reset stage S1, the first switch circuit and the second switch circuit of the threshold voltage compensation and charging unit 1 are turned off. The first switching circuit is turned off, which prevents the sampling transistor T1 from being electrically conducted to the intermediate node G, resulting in uncertainty in the voltage of the intermediate node G. The second switch circuit is turned off to prevent the driving transistor T2 from being electrically conducted to the intermediate node G, which affects the light emission of the driving transistor T2, so that the driving transistor T2 can still maintain the light emission at the high level of the previous frame.
In this embodiment, the scan signal voltage Vscan inputted to the scan signal line is at a high level, so that the first switching transistor T4 and the second switching transistor T5 are both turned off.
Referring to fig. 3 and 5, in the threshold voltage compensation and charging stage S2, since the reference voltage Vint is low, the sampling transistor T1 is turned on, the voltage stabilizing capacitor C2 stabilizes the voltage of the gate of the sampling transistor T1, and the sampling transistor T1 is kept turned on; the scan signal voltage Vscan input to the scan signal line is at a low level, so that the first switching transistor T4 is turned on; the data signal line is turned on to the intermediate node G. Meanwhile, the second pole (i.e., drain) of the sampling transistor T1 is shorted to the gate, becoming a diode. The voltage of the data signal collected when the sampling transistor T1 is shorted as a diode is: vdata + Vth, the voltage of intermediate node G, is: vdata + Vth.
The scan signal voltage Vscan inputted to the scan signal line is at a low level, and the second switching transistor T5 is also turned on, so that the voltage Vdata + Vth of the intermediate node G can be transmitted to the gate of the driving transistor T2 and charged in the first plate of the storage capacitor C1.
Since the pixel driving circuit to which one light emitting device D is electrically connected is located in a very small local area of the display panel, the sampling transistor T1 and the driving transistor T2 have substantially the same threshold voltage Vth, and thus it can be considered that the voltage Vdata + Vth of the intermediate node G has compensated for the drift of the threshold voltage Vth of the driving transistor T2.
In the threshold voltage compensation and charging stage S2, the reset signal Vrset input by the reset signal line is at a high level, and the reset transistor T3 is turned off, so that the voltage of the intermediate node G is not affected.
Referring to fig. 3 and fig. 6, in the light emitting phase, the voltage difference between the gate and the first electrode (i.e., the source) of the driving transistor T2 is less than the threshold voltage, the driving transistor T2 is turned on, and the on-current of the driving transistor T2 is:
It can be seen that the current flowing through the light emitting device D is independent of the threshold voltage Vth of the driving transistor T2. The current flowing through each light emitting device D is independent of the threshold voltage Vth of the driving transistor T2, and the influence of the shift of the threshold voltage Vth on the light emitting device D can be avoided, so that the uniformity of the image brightness in the display area of the display panel and the display device can be improved.
In the light emitting stage, the scan signal voltage Vscan input to the scan signal line is at a high level, so that the first switching transistor T4 and the second switching transistor T5 are both turned off to avoid affecting the voltage of the gate of the driving transistor T2.
The pixel driving circuit omits a light-emitting control unit, so that the structure of the pixel driving circuit can be simplified, the pixel density is improved, and a circuit for providing a control signal for the light-emitting control unit is omitted.
Fig. 7 is a circuit diagram of a pixel driving circuit according to a second embodiment of the present invention. Referring to fig. 7, the pixel driving circuit of the present embodiment is substantially the same as the pixel driving circuit of fig. 1, except that: the sampling transistor T1, the driving transistor T2, the reset transistor T3, the first switching transistor T4, and the second switching transistor T5 are all N-type transistors.
Fig. 8 is a timing diagram corresponding to the driving method of the pixel driving circuit in fig. 7. Referring to fig. 8, the timing diagram of the present embodiment is substantially the same as the timing diagram of fig. 3, except that: the high and low levels of the scan signal voltage and the reset signal in each stage are opposite to those in fig. 3.
An embodiment of the invention provides a display panel including any one of the pixel driving circuits described above. Any one of the pixel driving circuits described above may be connected to a light emitting device D.
An embodiment of the present invention further provides a display device, including any one of the display panels described above. The display device may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.
It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element may also be present. Like reference numerals refer to like elements throughout.
In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "a", "an" and "the" mean one, two or more unless expressly defined otherwise.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A pixel driving circuit for driving a light emitting device to emit light, comprising:
the threshold voltage compensation and charging unit comprises a sampling transistor, wherein a first pole of the sampling transistor is electrically connected with a data signal line, a grid electrode of the sampling transistor is electrically connected with the intermediate node, and a second pole of the sampling transistor is suitable for being electrically connected with the grid electrode;
the reset unit has an input end electrically connected to the reference voltage line, a control end electrically connected to the reset signal line, and an output end electrically connected to the intermediate node;
a driving transistor, a first pole of which is electrically connected to a power line, a gate of which is adapted to be electrically connected to the intermediate node, and a second pole of which is electrically connected to the light emitting device; and
a memory cell, a first end of which is electrically connected to the grid of the driving transistor and a second end of which is electrically connected to the power line;
wherein, in a reset phase of the pixel driving circuit, the reset unit transmits the reference voltage inputted by the reference voltage line to the intermediate node under the control of a reset signal inputted by the reset signal line;
in a threshold voltage compensation and charging stage, the reference voltage keeps the threshold voltage compensation and charging unit to conduct the data signal line and the intermediate node, the voltage of the intermediate node is configured to be the data signal voltage acquired when the sampling transistor is short-circuited into a diode, and the voltage of the intermediate node is transmitted to the grid electrode of the driving transistor and charged into the first end of the storage unit;
the driving transistor receives a current supplied from the power line and supplies a driving current to the light emitting device according to a voltage of the intermediate node held by the first terminal of the memory cell during a light emitting period;
the threshold voltage compensation and charging unit includes: the sampling transistor, the first switch circuit, the second switch circuit and the voltage stabilizing capacitor are connected in series;
the voltage stabilizing capacitor is used for stabilizing the voltage of the grid electrode of the sampling transistor and keeping the sampling transistor on; the first switch circuit is controlled by a switch signal and is used for controlling the sampling transistor to be in short circuit to form a diode; the second switch circuit is controlled by a switch signal, and is used for controlling the voltage of the intermediate node to be transmitted to the grid electrode of the driving transistor and to be kept at the first end of the storage unit.
2. The pixel driving circuit according to claim 1, wherein the reset unit includes a reset transistor having a first pole electrically connected to the reference voltage line, a gate electrically connected to the reset signal line, and a second pole electrically connected to the intermediate node;
and/or the memory cell comprises a storage capacitor.
3. The pixel driving circuit according to claim 2, wherein the first switching circuit comprises a first switching transistor, and the second switching circuit comprises a second switching transistor;
the first pole of the first switch transistor is electrically connected to the second pole of the sampling transistor, the grid electrode of the first switch transistor is electrically connected to the scanning signal line, and the second pole of the first switch transistor is electrically connected to the grid electrode of the sampling transistor, the second polar plate of the voltage stabilizing capacitor, the first pole of the second switch transistor and the second pole of the reset transistor;
the grid electrode of the second switch transistor is electrically connected with a scanning signal line, and the second pole electrode is electrically connected with the grid electrode of the driving transistor and the first pole plate of the storage capacitor.
4. The pixel driving circuit according to claim 3, wherein the sampling transistor, the driving transistor, the reset transistor, the first switching transistor, and the second switching transistor are all P-type transistors; or the sampling transistor, the driving transistor, the reset transistor, the first switching transistor, and the second switching transistor are all N-type transistors.
5. A display panel comprising the pixel drive circuit according to any one of claims 1 to 4.
6. A display device characterized by comprising the display panel according to claim 5.
7. A method of driving the pixel driving circuit according to claim 1, comprising: a reset stage, a threshold voltage compensation and charging stage and a light-emitting stage;
the reset phase, inputting a reset signal to the reset signal line, and transmitting the reference voltage input by the reference voltage line to the intermediate node;
in the threshold voltage compensation and charging stage, the sampling transistor is controlled to be in short circuit to form a diode, and the data signal voltage acquired when the sampling transistor is in short circuit to form the diode is transmitted to the grid electrode of the driving transistor and is kept at the first end of the storage unit;
the light-emitting stage is used for controlling the driving transistor to receive the current supplied by the power line and providing driving current for the light-emitting device according to the data signal voltage held by the first end of the storage unit;
the sampling transistor is controlled to be in short circuit, and the diode inputs scanning signals to a scanning signal line to enable the first switching transistor to be switched on; and controlling the voltage of the data signal acquired when the sampling transistor is short-circuited into a diode to be transmitted to the grid electrode of the driving transistor and be kept at the first end of the storage unit, and enabling the second switching transistor to be opened by inputting a scanning signal to the scanning signal line.
8. The method according to claim 7, wherein a first pole of the first switching transistor is connected to a second pole of the sampling transistor, a gate of the first switching transistor is connected to the scanning signal line, and the second pole of the first switching transistor is connected to the gate of the sampling transistor.
9. The method according to claim 8, wherein a first pole of the second switching transistor is connected to the gate of the sampling transistor and a second pole of the first switching transistor, the gate is connected to the scanning signal line, and the second pole is connected to the gate of the driving transistor and the first end of the memory cell.
10. The method for driving the pixel driving circuit according to claim 9, wherein in the reset phase, a scan signal is input to the scan signal line, and the first switching transistor and the second switching transistor are turned off.
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